865879097 has 2 divisors, whose sum is σ = 865879098. Its totient is φ = 865879096.

The previous prime is 865879093. The next prime is 865879099. The reversal of 865879097 is 790978568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 744416656 + 121462441 = 27284^2 + 11021^2 .

It is a cyclic number.

It is not a de Polignac number, because 865879097 - 2² = 865879093 is a prime.

It is a super-2 number, since 2×865879097² = 1499493221243070818, which contains 22 as substring.

Together with 865879099, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (865879093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432939548 + 432939549.

It is an arithmetic number, because the mean of its divisors is an integer number (432939549).

Almost surely, 2^865879097 is an apocalyptic number.

It is an amenable number.

865879097 is a deficient number, since it is larger than the sum of its proper divisors (1).

865879097 is an equidigital number, since it uses as much as digits as its factorization.

865879097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The square root of 865879097 is about 29425.8236418286. The cubic root of 865879097 is about 953.1306128230.

The spelling of 865879097 in words is "eight hundred sixty-five million, eight hundred seventy-nine thousand, ninety-seven".